Analog Devices Inc./Maxim Integrated MAX1976EZT300-T

Overview

MAX1976EZT300-T from Maxim Integrated is a low-dropout linear regulator (LDO) delivering 300mA continuous output current with 100mV dropout at full load, ±0.5% output voltage accuracy, and a fixed 3.0V output. It operates from 1.62V to 3.6V input and integrates an active-low open-drain RESET output with 70ms delay, making it suitable for power sequencing in portable battery-powered systems such as notebook computers and cellular handsets.

For engineers reviewing the MAX1976EZT300-T datasheet, MAX1976EZT300-T pinout, MAX1976EZT300-T application, or MAX1976EZT300-T equivalent, key selection criteria include guaranteed 300mA load capability under low-input-voltage conditions (≥1.62V), thermal-overload and short-circuit protection, logic-controlled shutdown, and compatibility with low-ESR ceramic output capacitors (4.7µF).

Technical Context

The MAX1976EZT300-T uses an internal P-channel MOSFET pass transistor (R_DS(ON) = 0.33Ω) enabling supply current independence from load and dropout voltage - critical for battery life in portable devices. Its error amplifier compares a precision reference against feedback from the internal voltage divider to regulate the 3.0V output.

RESET functionality monitors V_OUT with 82.5% threshold accuracy and 1.7% hysteresis; RESET asserts immediately on undervoltage or shutdown and remains asserted ≥70ms after regulation is achieved. Thermal shutdown activates at +165°C with 15°C hysteresis.

Key Specifications

Pinout & Package

MAX1976EZT300-T is packaged in a 6-pin thin SOT23-6 (Z6-1) package, height <1.1mm, footprint 2.9mm × 2.8mm. The exposed pad is not present in SOT23; thermal dissipation relies on GND pin soldering to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with TPS73030DBVR and MCP1825-3002E/DB, the MAX1976EZT300-T uniquely integrates a 70ms-delayed RESET output in the same ultra-small SOT23 package - eliminating BOM count and layout area while ensuring robust power sequencing in battery-powered portable systems.

Availability

MAX1976EZT300-T is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and digital cameras requiring stable component supply with consistent lead times and RoHS-compliant sourcing.

Supply support for MAX1976EZT300-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power management, sensing, and communication applications.

The MAX1963/MAX1976 product line delivers low-input-voltage, high-accuracy LDOs with integrated RESET for space- and power-constrained portable electronics - targeting battery-powered handhelds where dropout, quiescent current, and sequencing reliability are critical.

FAQ

What is the output voltage tolerance of the MAX1976EZT300-T over temperature and load?

The MAX1976EZT300-T guarantees ±0.5% output voltage accuracy across -40°C to +85°C, 1mA to 300mA load, and input voltage from (V_OUT + 0.5V) to +3.6V. This tight tolerance ensures reliable operation of downstream logic and analog circuits without external trimming. The MAX1976EZT300-T achieves this via factory-trimmed internal feedback resistors and a precision bandgap reference.

Does the MAX1976EZT300-T require external capacitors, and what values are recommended?

Yes, the MAX1976EZT300-T requires a 1µF ceramic capacitor between IN and GND, and a 4.7µF low-ESR ceramic capacitor between OUT and GND. These values ensure stability across temperature and load, suppress input ripple, and maintain ≤20mV load-transient deviation. Using capacitors outside these recommendations may cause oscillation or degraded PSRR. The MAX1976EZT300-T datasheet specifies ESR ≤30mΩ for optimal performance.

How does the RESET output of the MAX1976EZT300-T behave during power-up and brownout?

The MAX1976EZT300-T RESET output is an active-low open-drain signal that remains low until V_OUT reaches ≥82.5% of 3.0V and stays asserted for ≥70ms thereafter. During brownout, RESET falls immediately if V_OUT drops below that threshold. It also asserts low during SHDN activation. An external pull-up resistor (typically 10kΩ to 3.3V) is required. This behavior is fully specified in the MAX1976EZT300-T electrical characteristics table.

Can the MAX1976EZT300-T be used with a 1.8V input to deliver 3.0V output?

No - the MAX1976EZT300-T cannot regulate 3.0V from a 1.8V input because its minimum input voltage is V_OUT + dropout. With 100mV dropout, it requires ≥3.1V input for 3.0V output. At 1.8V input, the device enters dropout and output collapses. The MAX1976EZT300-T is designed for inputs from 1.62V only when V_OUT ≤ 1.5V; for 3.0V output, VIN must be ≥3.1V. Always verify operating point using the MAX1976EZT300-T power dissipation curves.

What thermal protection features does the MAX1976EZT300-T include?

The MAX1976EZT300-T incorporates thermal-overload protection that disables the pass transistor when junction temperature exceeds +165°C, then re-enables it after cooling by 15°C. This prevents permanent damage during sustained overload or inadequate PCB heatsinking. The device also specifies absolute maximum junction temperature (+150°C) and continuous power dissipation limits (727mW for SOT23 at +70°C ambient). These protections are inherent to the MAX1976EZT300-T silicon design and require no external components.